#1878450 - 01/23/08 09:27 PM
Room EQ graph question for Ethan or.......
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Fumblyfingers
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Registered: 01/21/06
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.....anyone else knowledgeable about this.
Firstly thank you Ethan for the unselfish manner in which you share the wealth of knowledge you have with anyone who seeks it out.
I am a guitarist of +/-40 years who about 10 years ago started trying to record my own music at home, first on a 16 track Fostex to now I am using an Intel Mac Pro with Pro Tools LE. So as you can see I am an amateur as far as acoustics and audio recording. Any help will be much appreciated.
Two years ago a 2nd baby arrival ( yup, late in life ) meant me losing my "studio" in my house. I had nowhere to go other than a small footprint I was able to clear in our much used garage to build a small room in. I followed as many of the pointers I could from your website Ethan, and my budget was really small. I built the walls slightly off parallel, the ceiling slopes slightly front to back and side to side, I floated and decoupled the floor from the slab and walls, used drywall and fiberglass and also some Celotex covering for the wall and ceiling construction. It sounds okay to me and I can mix at decent levels without the sound traveling out the garage too badly. When it is approaching an uncomfortably loud SPL in here, it just sounds like someone is listening to a small boombox inside the garage, when checking the level at the sidewalk roughly 25 feet away. You hardly hear it at all.
It is a very small room.
Recently I became curious about measuring my room so here are the graphs.
I bought a Radio Shack SPL meter for the task.
The first is a hand plotted graph using your test tone CD and graph.
The next two are using Room EQ Wizard software ...on my Mac.
First an REW measurement at the mix position with waterfall.
Then an REW measurement at about 2' off either wall in the left corner of the room, with it's waterfall.
Are you able to tell me anything from these readings?
Also, if I go for corner traps across the corners....do the tops and bottoms have to be sealed by triangular sections say 3/4" ply, or can they be open.
You say these traps can be adjacent in the corners. If I do that or mount across the corners, can I then just mix it up where I put a couple high bass and mid bass traps on the rear and side walls...or do they need to be placed in specific spots?
I really appreciate your time. Thanks.
Test Tone CD hand plot
REW at mix position
REW at 2' off each wall in LT Rear corner.
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#1878604 - 01/24/08 07:35 AM
Re: Room EQ graph question for Ethan or.......
[Re: Fumblyfingers]
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Ethan Winer
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Registered: 06/12/00
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Loc: New Milford, CT, USA
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Are you able to tell me anything from these readings?
Yes, you need more bass traps. 
Also, if I go for corner traps across the corners....do the tops and bottoms have to be sealed by triangular sections say 3/4" ply, or can they be open.
No, just use fiberglass with no wood in front, as described in the Forum FAQ linked in the READ THIS FIRST post.
--Ethan
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#1878685 - 01/24/08 09:32 AM
Re: Room EQ graph question for Ethan or.......
[Re: Ethan Winer]
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Fumblyfingers
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Ethan, thank you so much for getting back. Yes I did see tha"read this first" after I posted...sorry about that.
1) Is 1" too thin for the corner traps?
I noticed all the traps on your plans call for 1" in different configurations, but elsewhere on your site you say 1" is too thin for deep bass trapping.
2)I saw somewhere an idea to stack rigid fiberglass in wedges and fill the entire corner as a solid trap....how do you feel about that...or do you prefer an air gap?
3) You say it is okay on a small room to fix the rigid directly to the walls. Would it be a waste of time and money to build actual low, mid and high bass traps as per your plans in such a small room or will it be advantageous?
Thanks....really appreciate it
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#1878692 - 01/24/08 09:43 AM
Re: Room EQ graph question for Ethan or.......
[Re: Fumblyfingers]
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Fumblyfingers
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Okay I see at the other post to use 4" for the cornertraps and I am assuming an air gap is good. So if you could just address question 3 that would be fantastic....thank you.
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#1879296 - 01/25/08 09:42 AM
Re: Room EQ graph question for Ethan or.......
[Re: Fumblyfingers]
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Ethan Winer
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Loc: New Milford, CT, USA
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Generally, spacing rigid fiberglass off the walls works better than putting it directly on the walls. If you can't easily do that, so be it. Regardless, in a small room I would not use wood panel bass traps at all.
--Ethan
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#1885360 - 02/04/08 07:28 PM
Re: Room EQ graph question for Ethan or.......
[Re: Fumblyfingers]
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Speaker Boy
Senior Member
Registered: 02/04/08
Posts: 62
Loc: Santa Barbara, California
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1) Is 1" too thin for the corner traps?
The thicker the better for bass traps. The typical recommendation is at least 4" thick for corner bass traps. "703 fiberglass one inch thick absorbs reasonably well down to 500 Hz. When two inches thick, the same material is equally absorbent down to 250 Hz." You have a huge basspeak at <50hz. So thicker the better.
Read this webpage
http://www.ethanwiner.com/acoustics.html
2)I saw somewhere an idea to stack rigid fiberglass in wedges and fill the entire corner as a solid trap....how do you feel about that...or do you prefer an air gap?
A solid trap will gain you 15-20% better absorption than just having a 4" thick panel across the corner. But a solid trap will cost 3-4 times more. That is why he normally suggests just putting a panel across the corner. You would be better off using the extra material to put traps in all 12 corners of the room.
Edited by speaker_boy (02/04/08 07:30 PM)
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#1885657 - 02/05/08 09:43 AM
Re: Room EQ graph question for Ethan or.......
[Re: Speaker Boy]
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Ethan Winer
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Loc: New Milford, CT, USA
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^^^^^^^
All great advice above.
Hey, who was that masked man?
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#1885877 - 02/05/08 01:59 PM
Re: Room EQ graph question for Ethan or.......
[Re: Ethan Winer]
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Speaker Boy
Senior Member
Registered: 02/04/08
Posts: 62
Loc: Santa Barbara, California
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Thanks Ethan,
I am just one of those people who over researches everything he does. Your acoustics summary is very easy to read and has tons of info. So I figure I should answer some questions here to help out. Plus if I help out now then maybe I will get more help when I get confused:)
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